Whey protein is a high quality protein processed from cow milk. Whey protein is used as dietary supplement (as protein supplement), mostly for those who exercise a lot to build body muscles (body builders) and those who go on diet to lose weight (dieters). As with the case of any other dietary supplement, whey protein too has its benefits and side effects. it is considered the richest known source of naturally occurring branched chain amino acids (leucine, isoleucine and valine).Read less